Robust respiration rate estimation using adaptive Kalman filtering with textile ECG sensor and accelerometer. - Nicholas N. Lepine; Takuro Tajima; Takayuki Ogasawara; Ryoichi Kasahara; Hiroshi Koizumi (EMBC, 2016)

96-Gbaud PDM-8QAM Single Channel Transmission over 9, 600 km by Nonlinear Tolerance Enhancement using PPLN-based Optical Phase Conjugation. - Takayuki Kobayashi; Takeshi Umeki; Ryoichi Kasahara; Hiroshi Yamazaki; Munehiko Nagatani; Hitoshi Wakita; Hirokazu Takenouchi; Yutaka Miyamoto (OFC, 2018)

Over-100-Spatial-Channel Programmable Spectral Processor for SDM Signal Monitoring. - Mitsumasa Nakajima; Kenya Suzuki; Kazunori Seno; Takashi Goh; Ryoichi Kasahara; Mitsunori Fukutoku; Yutaka Miyamoto; Toshikazu Hashimoto (OFC, 2018)

Towards Practical Implementation of Optical Parametric Amplifiers Based on PPLN Waveguides. - Takeshi Umeki; Takushi Kazama; Takayuki Kobayashi; Koji Enbutsu; Osamu Tadanaga; Hirokazu Takenouchi; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2018)

Polarization-diversity In-line Phase Sensitive Amplifier for Simultaneous Amplification of Fiber-transmitted WDM PDM-16QAM Signals. - Takeshi Umeki; Takushi Kazama; Takayuki Kobayashi; Shigehiro Takasaka; Yasuhiro Okamura; Koji Enbutsu; Osamu Tadanaga; Hirokazu Takenouchi; Ryuichi Sugizaki; Atsushi Takada; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2018)

Scaling advantages of all-to-all connectivity in physical annealers: the Coherent Ising Machine vs. D-Wave 2000Q. - Ryan Hamerly; Takahiro Inagaki; Peter L. McMahon; Davide Venturelli; Alireza Marandi; Tatsuhiro Onodera; Edwin Ng; Carsten Langrock; Kensuke Inaba; Toshimori Honjo; Koji Enbutsu; Takeshi Umeki; et al. (CoRR, 2018)

Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump. - Takushi Kazama; Takeshi Umeki; Yasuhiro Okamura; Koji Enbutsu; Osamu Tadanaga; Atsushi Takada; Ryoichi Kasahara (OECC/PSC, 2019)

1.4μm-1.6μm Wavelength Conversion Using Multiple Quasi-Phase Matching LiNbO3. - Saroeun Punhavan; Masato Kato; Keisuke Sugiyama; Masaki Asobe; Takeshi Umeki; Koji Enbutsu; Takushi Kazama; Takahiro Kashiwazaki; Ryoichi Kasahara (OECC/PSC, 2019)

Nonlinearity mitigation of PDM-16QAM signal using multiple CSI-OPCs in ultra-long haul transmission without excess penalty. - Takeshi Umeki; Takayuki Kobayashi; Akihide Sano; Takuya Ikuta; Masashi Abe; Takushi Kazama; Koji Enbutsu; Ryoichi Kasahara; Yutaka Miyamoto (OECC/PSC, 2019)

Wavefront-Matching-Method-Designed Six-Mode-Exchanger Based on Grating-Like Waveguide on Silica-PLC Platform. - Takeshi Fujisawa; Taiji Sakamoto; Masashi Miyata; Takashi Matsui; Toshikazu Hashimoto; Ryoichi Kasahara; Kazuhide Nakajima; Kunimasa Saitoh (OFC, 2020)

Wideband Inline-Amplified WDM Transmission using PPLN-Based OPA with Over-10-THz Bandwidth. - Takayuki Kobayashi; Shimpei Shimizu; Masahito Nakamura; Takeshi Umeki; Takushi Kazama; Ryoichi Kasahara; Fukutaro Hamaoka; Munehiko Nagatani; Hiroshi Yamazaki; Takayuki Mizuno; Hideyuki Nosaka; Yutaka Miyamoto (OFC, 2020)

Gain Ripple and Passband Narrowing Due to Residual Chromatic Dispersion in Non-Degenerate Phase-Sensitive Amplifiers. - Shimpei Shimizu; Takushi Kazama; Takayuki Kobayashi; Takeshi Umeki; Koji Enbutsu; Ryoichi Kasahara; Yutaka Miyamoto (OFC, 2020)

Collective and synchronous dynamics of photonic spiking neurons. - Takahiro Inagaki; Kensuke Inaba; Timothée G. Leleu; Toshimori Honjo; Takuya Ikuta; Koji Enbutsu; Takeshi Umeki; Ryoichi Kasahara; Kazuyuki Aihara; Hiroki Takesue (CoRR, 2020)

PPLN-Based Low-Noise Phase Sensitive Amplification Using an Optical Phase-Locked Pump. - Takushi Kazama; Takeshi Umeki; Yasuhiro Okamura; Koji Enbutsu; Osamu Tadanaga; Atsushi Takada; Ryoichi Kasahara (IEICE Trans. Commun., 2020)

Nonlinearity Mitigation of PDM-16QAM Signals Using Multiple CSI-OPCs in Ultra-Long-Haul Transmission without Excess Penalty. - Takeshi Umeki; Takayuki Kobayashi; Akihide Sano; Takuya Ikuta; Masashi Abe; Takushi Kazama; Koji Enbutsu; Ryoichi Kasahara; Yutaka Miyamoto (IEICE Trans. Commun., 2020)

13.4-Tb/s WDM Transmission over 1, 280 km Repeated only with PPLN-based Optical Parametric Inline Amplifier. - Takayuki Kobayashi; Shimpei Shimizu; Masanori Nakamura; Takushi Kazama; Takeshi Umeki; Ryoichi Kasahara; Fukutaro Hamaoka; Yutaka Miyamoto (ECOC, 2021)

8-Tbps (20 × 400 Gbps) Unrepeated Transmission over 80 km with 2-THz PPLN-Based Phase-Sensitive Amplification Using Precise Chromatic Dispersion Pre-Compensation. - Shimpei Shimizu; Takayuki Kobayashi; Takushi Kazama; Takeshi Umeki; Masanori Nakamura; Koji Enbutsu; Ryoichi Kasahara; Yutaka Miyamoto (ECOC, 2021)

Wideband PPLN-based optical parametric amplifiers for scalable optical transport network. - Yutaka Miyamoto; Takayuki Kobayashi; Takeshi Umeki; Takushi Kazama; Koji Enbutsu; Shimpei Shimizu; Ryoichi Kasahara (OFC, 2021)

Silica-PLC based mode-dependent-loss equalizer for two LP mode transmission. - Takeshi Fujisawa; Takayoshi Mori; Junji Sakamoto; Yoko Yamashita; Taiji Sakamoto; Ryota Imada; Ryoto Ima; Takanori Sato; Kei Watanabe; Ryoichi Kasahara; Toshikazu Hashimoto; Kazuhide Nakajima; et al. (OFC, 2022)

Channel Arrangement Design in Lumped Amplified WDM Transmission over NZ-DSF Link with Nonlinearity Mitigation Using Optical Phase Conjugation. - Shimpei Shimizu; Takayuki Kobayashi; Takeshi Umeki; Takushi Kazama; Koji Enbutsu; Ryoichi Kasahara; Yutaka Miyamoto (IEICE Trans. Commun., 2022)